The P0080 DTC is a DTC code that would be expected to occur on a motor with variable cam timing. The problem is that a 1999-2004 GT does NOT have variable cam timing.
Are you positive the replacement PCM is for a SOHC 4.6 GT 1999-2004?
Whenever a DTC calls out a "circuit Malfunction" it means there's something so wrong with the basic circuit that the PCM is unable to perform any diagnosis. Think Open, short, ground fault, wiring, or a bad sensor.
Since the fuel level sensor worked (I assume) previously we should assume that the fuel level sensor is good. Suggest starting by double checking the PCM connector for bent/pushed pins. Then monitor the FLI PID.
But since a damaged cluster is one of the possible "causes", given the other problems you are having with the cluster, this may be a great place to start.
my speedometer doesn’t work but every other gauge does on my 99gt cluster my car was a 2004 v6 swapped with a 99gt everything I don’t know how to fix this speedometer problem my obd2 read the car is going 17 kph max even when we are on the highway
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P0460 - Fuel Level Sensor Circuit Malfunction
The PCM monitors the fuel level input (FLI) circuit for electrical failure. The test fails when the signal moves outside the minimum or maximum allowable calibrated parameters for a specified fuel fill percentage in the fuel tank.
Empty fuel tank
Fuel pump (FP) module stuck open
Incorrectly installed fuel gauge
Damaged instrument cluster
CASE GND circuit open
FLI shorted to VPWR
Damaged PCM
Overfilled fuel tank
Fuel pump (FP) module stuck closed
Damaged fuel gauge
FLI circuit open
FLI circuit shorted to CASE GND or PWR GND
CSE GND shorted to VPWR
Monitor FLI PID and FLI V PID in key ON engine RUNNING. FLI PID at 25% fill (with non matching fuel gauge) and FLI V PID less than 0.90 volts [for FLI PID at 75% fill (with non matching fuel gauge) and FLI V PID greater than 2.45 volts] indicates a hard fault
Whenever a DTC calls out a "circuit Malfunction" it means there's something so wrong with the basic circuit that the PCM is unable to perform any diagnosis. Think Open, short, ground fault, wiring, or a bad sensor.
Since the fuel level sensor worked (I assume) previously we should assume that the fuel level sensor is good. Suggest starting by double checking the PCM connector for bent/pushed pins. Then monitor the FLI PID.
But since a damaged cluster is one of the possible "causes", given the other problems you are having with the cluster, this may be a great place to start.
>>
P0460 - Fuel Level Sensor Circuit Malfunction
The PCM monitors the fuel level input (FLI) circuit for electrical failure. The test fails when the signal moves outside the minimum or maximum allowable calibrated parameters for a specified fuel fill percentage in the fuel tank.
Empty fuel tank
Fuel pump (FP) module stuck open
Incorrectly installed fuel gauge
Damaged instrument cluster
CASE GND circuit open
FLI shorted to VPWR
Damaged PCM
Overfilled fuel tank
Fuel pump (FP) module stuck closed
Damaged fuel gauge
FLI circuit open
FLI circuit shorted to CASE GND or PWR GND
CSE GND shorted to VPWR
Monitor FLI PID and FLI V PID in key ON engine RUNNING. FLI PID at 25% fill (with non matching fuel gauge) and FLI V PID less than 0.90 volts [for FLI PID at 75% fill (with non matching fuel gauge) and FLI V PID greater than 2.45 volts] indicates a hard fault